66637525700 has 144 divisors (see below), whose sum is σ = 151064331264. Its totient is φ = 25495209600.

The previous prime is 66637525687. The next prime is 66637525711. The reversal of 66637525700 is 752573666.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50984447 + ... + 50985753.

It is an arithmetic number, because the mean of its divisors is an integer number (1049057856).

Almost surely, 2^66637525700 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66637525700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75532165632).

66637525700 is an abundant number, since it is smaller than the sum of its proper divisors (84426805564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66637525700 is a wasteful number, since it uses less digits than its factorization.

66637525700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602 (or 1595 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 47.

The spelling of 66637525700 in words is "sixty-six billion, six hundred thirty-seven million, five hundred twenty-five thousand, seven hundred".